Grate.



Patented Oct. 24, I899.

B. J. SGHW-AB.

GBATE.

(Application filed Feb. 20, 1891.)

(No Model.)

a j a gizerab MM fll'iavnga.

UNITED STATES PATENT OFFICE.

RUDOLPH J. SCl-IWAB, OF MILWAUKEE, WISCONSIN.

GRATE.

SPECIFICATION forming part of Letters Patent No. 635,400, dated October24, 1899.

Application filed February 20,1891. Serial No. 382,233- N mod l- To allwhom it may concern:

Be it known that I, RUDOLPH J. SOHWAB, of Milwaukee, in the county ofMilwaukee and State of Wisconsin, have invented certain new and usefulImprovements in Grates and I do hereby declare that the following is afull, clear, and exact description of the invention, which will enableothers skilled in the art to which it pertains to make and use the same,reference being had to the accompanying drawings, and to the letters ofreference marked thereon, which form a part of this specification.

The main objects of my invention are to improve the construction andfacilitate the operation of rocking grates to prevent clogging of thesame and to facilitate the removal of the grate-bars for the purpose ofrepairs.

It consists of certain peculiarities of construction and arrangementhereinafter particularly described, and pointed out in the claim.

Figure 1 is a plan view of a grate embodying my improvements. Fig. 2 isa crosssection, on an enlarged scale, of the grate-bars. Fig. 3 is afront elevation of the grate, showing the connection between thegrate-bars. Fig. 4 is a perspective view, on an enlarged scale, of adetachable extension of the middle grate-bar; and Fig. 5 is across-section of the same.

A represents the ash-pit or base of the furnace, which is provided withsuitable bearings for the grate-bars.

B B represent the grate-bars, cast or otherwise suitably provided withlateral projections 6 I), having curved faces which are concentric withthe axes of said grate-bars and form obtuse angles with the flattenedtops thereof, as shown in Fig. 2. The projections b b on one side of thebars are made longer than the projections b b on the opposite side, withwhich they alternate to afiord a wider opening when the grate-bars areturned to the left, as shown by dotted lines in Fig. 2, for releasingand dropping clinkers or dumping the contents of the fire-pot. Withinthe limits of the rocking movement ordinarily given to the grate-bars inshaking a grate the same width of opening is maintained between thecurved faces of the projections b b on' the adjacent grate-bars, andclinkers, lumps of coal, or other hard substances too large to fallbetween the grate-bars ride upon the curved faces of said projectionswithout impeding their movement and are crushed or gradually pulverizedby the abrading action of said curved faces and of the obtuse anglesformed by their intersection with the flattened tops of the grate-bars.The sticking or clogging of the grate is thus prevented.

The front ends of the grate-bars are supported by a removable plate 0,bolted to the under side of the top plate of the ash-pit, and areformed'with crank-arms b 17 which are connected on both sides by bars orlinks d d, as shown in Figs. 1 and 3.

The middle grate-bar (or, if there is an even number, one of the middlebars) is formed with a tongued tenon at its front end to fit a similarsocket in the removable extension E,which projects through a perforationin the doorplate F of the furnace, and is squared at its outer end toreceive the shaking crank or handle, as shown in Figs. 1, 4, and 5.

' The extension E is fastened in place on the end of the grate-bar shaftby a pin 6, as shown in Fig. 5. By means of this construction thegrate-bars can be readily removed from the ash-pit for repairs withoutdisturbing the door-plate F of the furnace by simply removing theextension E and detaching the plate 0, which supports the front ends ofthe gratebars. The joint by which the extension E is attached to themiddle grate-bar may be cast as shown in the drawings and requires nomachine-work or hand fitting. It not only affords an efficientconstruction for the purpose, but is also simple and cheap.

The inwardly-proj ecting flange a at the top of the ash-pit surroundingthe grate is formed at the sides with projections a 0. similar toandalternating with the projections on the adjacent grate-bars.

To permit of a greater throw of the shaking crank or handle to the leftfor the purpose of dumping the contents of the fire-pot, I set thecrank-arms b b at an inclination from a perpendicular when thegrate-bars are in their middle position, as shown in Figs. 1 and 3.

In the ordinary operation of shaking to remove ashes and clinkers fromthe fire-pot the grate-bars are rocked back and forth a limiteddistance, the same width of space being preserved during the operationbetween the curved faces of the projections to, Z), and l) on the frameof the grate and adjacent gratebars.

The movement of the grate-bars in the foregoing operation isapproximately from the position in which they are shown in Fig. 2 to theright. To produce a Wider opening for the purpose of dropping clinkerswhich cannot be readily crushed or pulverized in the manner previouslydescribed and to dump the entire contents of the fire-pot, thegrate-bars are turned to the left, as indicated by dotted lines in Fig.2.

Various changes may be made in the details of construction andarrangement of the grate within the scope of my invention.

I claim The combination in afurnace-grate of rocking grate-bars providedwith lateral projections having curved upper surfaces concentric withthe axes of said bars; the projections on one side of said bars beinglonger than on the other, and provided also with crank-arms which areset at an inclination to a perpendicular when the grate-bars are intheir middle or normal position, and a link pivoted to and connectingsaid crank-arms,substantially as and for the purposes set forth.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

RUDOLPH J. SCIIXVAB. Witnesses:

A. A. L. SMITH, E. O. AsMUs.

